Pure water cannot be obtained back once it is mixed with ________.
When we mix oil in a glass of water, two things happen:
1) The oil does not mix with water.
2) It settles on top of water making a separate layer.
What is the reason for these two phenomena? Mention the property being exhibited by the oil. [3 MARKS]
Statement I: Melting is a physical change as the melted wax can again be obtained as solid wax upon cooling Statement II: Burning of wax is a chemical change, as once the wax has been burnt, it cannot be obtained back in its original form.
Which of the following option is correct?